Method of recovering metal values from ores

C - Chemistry – Metallurgy – 22 – B

Patent

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Details

C22B 3/06 (2006.01) C22B 3/20 (2006.01) C22B 3/46 (2006.01) C22B 21/00 (2006.01) C22B 23/00 (2006.01)

Patent

CA 2685369

An improved method for processing of nickel bearing saprolite and limonite ores to recover the valuable minerals contained therein, comprising leaching the ore with nitric acid to form a slurry; separating the iron values by precipitation, removing the iron values; forming a liquid/solid residue in which nickel, cobalt and magnesium are in solution, and manganese and aluminum are solid residues in oxide form; conducting a liquid-solid separation and removing the solids; and recovering the nickel, cobalt, and manganese from the liquid-metal concentrate. The leachate is recovered and nitric acid from the leachate is recycled.

L'invention porte sur une méthode améliorée de traitement de minerais de saprolite et de limolite à teneur en nickel pour y récupérer les minéraux de valeur y étant contenus. Ladite méthode consiste: à lixivier le minerai avec de l'acide nitrique pour former une boue; à séparer par précipitation les éléments ferreux; à éliminer les éléments ferreux; à former un résidu liquide/solide dans lequel le nickel, le cobalt et le magnésium sont en solution et le manganèse et l'aluminium sont des résidus solides sous forme d'oxydes; à effectuer une séparation liquide-solide et à éliminer les solides; et à récupérer le nickel, le cobalt et le magnésium du concentré liquide/métal. Le lixiviat est récupéré et l'acide nitrique qu'il contient est recyclé.

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